Merge #1922

1922: feat: I/O safety for 'kmod' r=asomers a=SteveLauC

#### What this PR does:

1. Adds I/O safety for module `kmod`.

Co-authored-by: Steve Lau <[email protected]>

Author: bors[bot]

src/kmod.rs

@@ -3,7 +3,7 @@
 //! For more details see
 
 use std::ffi::CStr;
-use std::os::unix::io::AsRawFd;
+use std::os::unix::io::{AsFd, AsRawFd};
 
 use crate::errno::Errno;
 use crate::Result;
@@ -79,15 +79,15 @@ libc_bitflags!(
 /// ```
 ///
 /// See [`man init_module(2)`](https://man7.org/linux/man-pages/man2/init_module.2.html) for more information.
-pub fn finit_module<T: AsRawFd>(
-    fd: &T,
+pub fn finit_module<Fd: AsFd>(
+    fd: &Fd,
     param_values: &CStr,
     flags: ModuleInitFlags,
 ) -> Result<()> {
     let res = unsafe {
         libc::syscall(
             libc::SYS_finit_module,
-            fd.as_raw_fd(),
+            fd.as_fd().as_raw_fd(),
             param_values.as_ptr(),
             flags.bits(),
         )